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| All Patents in class 122/40 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 287,211 | Oct. 23, 1883 | C. Ahrens | Steam-generator | |
 | 742,480 | Oct. 27, 1903 | E.I. Nichols | Steam-generator | |
| 2,116,498 | May 10, 1938 | E.A. Hall | Grinding Machine | ||